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| Earthquake triggering and delaying caused by fault interaction on Xianshuihe fault belt,southwestern China | |
| 作者姓名： | 张秋文 张培震 王乘 汪一鹏 Michael A Ellis |
| 作者单位： | [1]HuazhongUniversityofScienceandTechnology,Wuhan430074,China [2]InstituteofGeology,ChinaSeismologicalBureau,Beijing100029,China [3]UniversityofMemphis,MemphisTN38152,USA |
| 基金项目： | State Natural Science Foundation of China (No49834002)，United foundation of Seismological Science (No100061) and Key Project of China Seismological Bureau (No95041007). |
| 摘 要： | The coseismic Coulomb stress change caused by fault interaction and its influences on the triggering and delaying of earthquake are briefly discussed.The Xianshuihe fault belt consists of Luhuo,Daofu,Kangding,Qianning and Ganzi fault.Luohuo(Ms=7.6,1973)-Kangding(Ms=6.2,1975)-Daofu(Ms=6.9,1981)-Ms=6.0,1982)earthquake is a seismic sequence continuous on the time axis with magnitude greater than6.0.They occurred on the Luhuo.Kangding,Daofu and Ganzi fault,respectively.The coseismic Coulomb stress changes caused by each earthquake on its surrounding major faults and microcracks are calculated,and their effects on the triggering and delaying of the next earthquake and aftershocks are analyzed.It is shown that each earthquake of the sequence occurred on the fault segment with coseismic Coulomb stress increases caused by its predecessors,and most after-shocks are distributed along the microcracks with relatively larger coseismic Coulomb stress increases resulted from the main shock.With the fault interaction considered,the seismic potential of each segment along Xianshuihe fault belt is reassessed,and contrasted with those predicted results ignoring coseismic Coulomb stress change,the significance of fault interaction and its effect on triggering and delaying of earthquake are emphasized.It is con-cluded that fault interaction plays a very important role on seismic potential of Xianshuihe fault belt,and the maximal change of future earthquake probability on fault segment is up to 30.5%. |
| 关 键 词： | 地震 触发机制 断层 咸水河断裂带 中国 西南地区 微裂纹 余震 |
| 收稿时间： | 28 September 2001 |
| 修稿时间： | 9 December 2002 |
Earthquake triggering and delaying caused by fault interaction on Xianshuihe fault belt, southwestern China |
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| Zhang Qiu-wen , Zhang Pei-zhen , Wang Cheng , Wang Yi-peng and Michael A Ellis.Earthquake triggering and delaying caused by fault interaction on Xianshuihe fault belt,southwestern China[J].Acta Seismologica Sinica(English Edition),2003,16(2):156-165. | |
| Authors: | Zhang Qiu-wen Zhang Pei-zhen Wang Cheng Wang Yi-peng and Michael A Ellis |
| Institution: | 1. Huazhong University of Science and Technology, Wuhan 430074, China 2. Institute of Geology, China Seismological Bureau, Beijing 100029, China 3. University of Memphis, Memphis TN 38152, USA |
| Abstract: | The coseismic Coulomb stress change caused by fault interaction and its influences on the triggering and delaying of earthquake are briefly discussed. The Xianshuihe fault belt consists of Luhuo, Daofu, Kangding, Qianning and Ganzi fault. Luohuo (MS=7.6, 1973)-Kangding (MS=6.2, 1975)-Daofu (MS=6.9, 1981)-Ganzi (MS=6.0, 1982) earthquake is a seismic sequence continuous on the time axis with magnitude greater than 6.0. They occurred on the Luhuo, Kangding, Daofu and Ganzi fault, respectively. The coseismic Coulomb stress changes caused by each earthquake on its surrounding major faults and microcracks are calculated, and their effects on the triggering and delaying of the next earthquake and aftershocks are analyzed. It is shown that each earthquake of the sequence occurred on the fault segment with coseismic Coulomb stress increases caused by its predecessors, and most after-shocks are distributed along the microcracks with relatively larger coseismic Coulomb stress increases resulted from the main shock. With the fault interaction considered, the seismic potential of each segment along Xianshuihe fault belt is reassessed, and contrasted with those predicted results ignoring coseismic Coulomb stress change, the significance of fault interaction and its effect on triggering and delaying of earthquake are emphasized. It is con-cluded that fault interaction plays a very important role on seismic potential of Xianshuihe fault belt, and the maximal change of future earthquake probability on fault segment is up to 30.5%. |
| Keywords: | coseismic Coulomb stress change fault interaction earthquake triggering and delaying seismic potential assessment Xianshuihe fault belt |
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